Sebastian's LITTLE SISTER!?and Ciel's NEW GIRL!?(black butler)

bet you'd never guess one tiny detail about Sebastian he has a little sister shes half demon and half witch as well and she does everything ten times better then Sebastian but in reality the only reason she does things so well is so she can impress her older brother and let me tell ya it's not easy(she even wheres cat ears and a tail and carries around a stuffed cat) and when she try's he only turns cold towards her and she gets clingy to Ciel for comfort and Sebastian's not happy.